A 4.00 kg block is suspended from a spring with k = 500 N/m. A 50.0 g

Question:

A 4.00 kg block is suspended from a spring with k = 500 N/m. A 50.0 g bullet is fired into the block from directly below with a speed of 150 m/s and becomes embedded in the block.
(a) Find the amplitude of the resulting SHM.
(b) What percentage of the original kinetic energy of the bullet is transferred to mechanical energy of the oscillator?